過去進(jìn)行時(shí)可以表示在過去某個(gè)時(shí)間點(diǎn)發(fā)生的事情。時(shí)間點(diǎn)可以用介詞短語.副詞或從句來表示。如：

What was she doing at nine o'clock yesterday?

昨天晚上九點(diǎn)她在做什么?(介詞短語表示時(shí)間點(diǎn))

When I saw him he was decorating his room.

當(dāng)我看見他的時(shí)候他正在裝飾房間。(when從句表示時(shí)間點(diǎn))

3.在復(fù)合句中，如果主要動作和背景動作都是延續(xù)的或同時(shí)發(fā)生的，那么主從句的動詞都可用過去進(jìn)行時(shí)。例如：

While he was waiting for the bus, he was reading a newspaper.

他邊等車邊看報(bào)。(兩個(gè)動作都是延續(xù)的)

He was cleaning his car while I was cooking.他擦車時(shí)我在做飯。(兩個(gè)動作同時(shí)進(jìn)行)

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